Harry Truman actually said...
Now, Therefore, I, Harry S. Truman, President of the United States of America, hereby declare and proclaim that the articles listed below shall, on and after April 15, 1948, be considered arms, ammunition, and implements of war for the purposes of section 12 of the said joint resolution of Congress.
Context
Proclamation 2776—Enumeration of Arms, Ammunition, and Implements of War
03/25/1948